A superlattice is a structure made up of alternating layers of two or more different materials, typically semiconductors. These layers are usually just a few nanometers thick, creating a periodic arrangement that can enhance certain electronic and optical properties. Superlattices are often used in advanced electronic devices, such as lasers and transistors, to improve performance. The unique properties of superlattices arise from quantum mechanical effects, which occur due to the thinness of the layers. This allows for the manipulation of electron behavior, leading to applications in quantum computing and photonic devices. Researchers continue to explore superlattices for potential innovations in technology.